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Mozilla Firefox is free, and it isn’t dangerous.
Free software is great – but often there’s a catch. Working out which free software is good and which is bad is tricky, but as a rule of thumb if the software is described as “free and open source” then you can be pretty certain (due to the requirements of this type of licence) that it is safe.
If you know where to look, free and open source software can be used to replace almost all of the tasks performed by premium software. Mozilla even offer an email application, Thunderbird.
Mozilla Firefox is available under the open source licence and has become the most popular alternative to Microsoft’s Internet Explorer browser.
Just to illustrate how good Mozilla Firefox is, other than being free, it was the first Windows browser to offer "tabbed browsing", adheres more strictly to web standards than Internet Explorer and has a sturdy add on module system to enhance your browsing with various tools that don't compromise the security of your PC.